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  • GEOPHYSICS  (2)
  • STRUCTURAL MECHANICS  (2)
  • Humans
  • 1975-1979  (4)
  • 1
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    Convection pattern and stress system under the African plate (1977)
    In:  Other Sources
    Details
    Publication Date: 2011-08-17
    Description: Studies on tectonic forces from satellite-derived gravity data have revealed a subcrustal stress system which provides a unifying mechanism for uplift, depression, rifting, plate motion and ore formation in Africa. The subcrustal stresses are due to mantle convection. Seismicity, volcanicity and kimberlite magmatism in Africa and the development of the African tectonic and magnetic features are explained in terms of this single stress system. The tensional stress fields in the crust exerted by the upwelling mantle flows are shown to be regions of structural kinship characterized by major concentration of mineral deposits. It is probable that the space techniques are capable of detecting and determining the tectonic forces in the crust of Africa.
    Keywords: GEOPHYSICS
    Type: Physics of the Earth and Planetary Interiors; 15; 1, Se; Sept
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Mantle convection pattern and subcrustal stress field under Asia (1978)
    In:  Other Sources
    Details
    Publication Date: 2011-08-17
    Description: Satellite tracking and surface gravity data are used to model the subcrustal stress fields in the terrestrial mantle beneath Asia; the results permit interpretation of the tectonic and seismic systems in China. The east and west China blocks, together with five seismic zones, are identified and related to metallogenic domains on the Chinese mainland. In addition, it is shown that the subcrustal stresses beneath China are arranged perpendicularly to the major fault systems and seismic belts. Stress calculations indicate a notable zone of compression in north China, associated with the Shansi Graben, the Linfen Basin Systems and, possibly, the high seismicity of the region.
    Keywords: GEOPHYSICS
    Type: Physics of the Earth and Planetary Interiors; 16; 3, Ap; Apr. 197
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Thermal loading in the laser holography nondestructive testing of a composite structure (1975)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: A laser holographic interferometry method that has variable sensitivity to surface deformation was applied to the investigation of composite test samples under thermal loading. A successful attempt was made to detect debonds in a fiberglass-epoxy-ceramic plate. Experimental results are presented along with the mathematical analysis of the physical model of the thermal loading and current conduction in the composite material.
    Keywords: STRUCTURAL MECHANICS
    Type: NASA-TR-R-439 , M-133
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 4
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    Forced motion of an initially stressed rectangular plate - An elasticity solution (1977)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: An initially stressed rectangular plate is subjected to a transverse, time dependent load. The initial stress field is constant and parallel to two of the plate edges. The transverse load is uniformly distributed over a rectangular area, the sides of which are parallel to the sides of the plate. The problem is formulated within the framework of classical, three-dimensional elasticity theory, and an exact solution is obtained in series form. The case of static stability under pre-stress is also considered.
    Keywords: STRUCTURAL MECHANICS
    Type: Journal of Sound and Vibration; 55; Dec. 8
    Format: text
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